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Very helpful indeed. A similar project (which others have commented on already https://www.instructables.com/id/Self-Watering-Pla... used a 9 volt battery to power the arduino, which is not ideal at all in my opinion. I thought it must be due to some limitation on the arduino's output capacity (what I thought was a max of 5v). Instead, the ability to power up to 12v using the arduino's power source (12v) via that Vin pin makes much more sense. Thanks
Very cool project. This instructable has inspired me to do something similar. I am new to Arduino and I am confused as to how you are powering the 12v pump. From the picture it looks like the pump is only connected to the motor driver chip and one other chip (not sure what that one is) and these two chips are connected directly to the Arduino. If the Arduino is being powered by the 12 v ac/dc adapter, but can only output a max of 5v, how is the pump being powered? Obviously, I am missing something.Looking through the comments you mentioned putting together a schematic a while back, time permitting. Any chance that has happened yet? It's also nice to see an author of an instructable be so responsive to others comments. I really appreciate your help.